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Unread 26-02-2012, 16:43
protoserge's Avatar
protoserge protoserge is offline
CAD, machining, circuits, fun!
AKA: Some call me... Tim?
FRC #0365 (MOE) & former 836 Mentor)
Team Role: Mentor
 
Join Date: Jan 2012
Rookie Year: 2002
Location: Wilmington, DE
Posts: 754
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Re: Shooter burning motors...but why?

If you have time to pick up some hobby motor heat sinks from towerhobbies.com, there are black ones that fit the 550 series diameter perfectly. I think we had to cut them to fit. http://www3.towerhobbies.com/cgi-bin...&I=LXNAB1&P=ML

Pretty much all failures with BaneBot motors are attributable to excessive heat buildup. I am working on an FRC MTBF plots for the BaneBots using our motors, understanding there are various uses and setups. If I have time, I'd like to put a call for data from the community.

Another thing to watch out for is case shorts. Once the motors heat up too much, the enamel used for sealing the shaft melts off and then the current is allowed to flow from each terminal to the case of the motor (and then your robot). Make sure you consider mounting with nylon screws and washers or other non-conductive hardware. Please note that a case short does not indicate the motor is gone. We've run case short motors for a reasonably long duration before they finally failed.

Last edited by protoserge : 26-02-2012 at 16:49.